Photo taken by Katy Haines at the 2013 Havering bioblitz
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Do you have any idea of size? Also were there any other signs of water vole around; neatly nibbled grass, droppings, runs into the water, prints?
The lack of vegetation around the hole does suggest water vole though.
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Lat/Lng: 51.5505, 0.2827
OS grid ref: TQ583859